Experimental procedures data handling

Experimental procedures for quantitative mass spectrometric analysis usually involve several steps. The final error results from the accumulation of the errors in each step, some steps in the procedure being higher error sources than others. A separation can be made between the errors ascribable to the spectrometer and its data treatment on the one hand and the errors resulting from the sample handling on the other. 

It is easily shown that both equations should extrapolate to a common intercept equal to [r ] and that k -f k should equal 0.5. The usual calculation procedure involves a double extrapolation of Eqs. (3-62) and (3-63) on the same plot, as shown in Fig. 3-7. This data handling method is generally satisfactory. Sometimes experimental results do not conform to the above expectations. This is because the real relationships are actually of the form... 

The first moment can be used in the determination of characteristic numbers provided careful data acquisition and experimental procedure are followed. Use of higher moments should be handled with great caution. 

A.M. Garforth, C.J. Rallis, The spherical bomb method for laminar burning velocity determination equipment, experimental procedure and data handling. Report No. 65, University of the Witwatersrand, Johannesburg, 1976... 

INAA is well suited to study homogeneity of small samples because of its dynamic range of elemental sensitivity. The technique allows for the use of small solid samples, with the smallest usable sample size in the range of 0.5 mg to i mg as determined by handling and blank considerations. The INAA analytical procedure is well understood and characterized with mathematical relationships. Its analytical uncertainties can be sufficiently controlled and can be well determined for a particular procedure. This allows the calculation of the contribution of material heterogeneity to the uncertainty budget based on experimental data. 

Of the many alternative methods of handling such data the most satisfactory systematic procedure seems to be that developed by Kreuzer [ 1 i]. Assuming only that the Law of Mass Action applies in terms of concentration units to the individual steps of the association process, Kreuzer deduced practically valuable relations between the monomer concentrations and the mean degree of association. When the experimental precision justifies it, it is advisable to use the mole traction as concentration unit throughout such studies. Mecke has systematized the thermodynamic relations for association processes in solution [12] Some of Davies and Thomas s results obtained by the Kreuzer analysis of thermistor data are given in Table 3. AH12,... 

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